It takes two and a half seconds for a laser beam to flash from Earth to the moon and back again. But it has taken 33 years of doing such experiments for scientists to glimpse what may be the moon's

Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for the cooling of antarctica as well. While average global temperatures

The recently rejuvenated Hubble Space Telescope, using its new main camera has produced a stunning set of images of dynamic processes in the far reaches of the universe.

Human Genome Sciences Inc. has described itself as working at the cutting edge of genomics, outpacing rivals in sifting through thousands of previously unknown human genes to come up with novel

The divisions between the world's leading nations over the Kyoto Protocol on global warming deepended dramatically when an informal discussion on climate change ended in disarray with both the United

The Bush administration has formally sought congressional approval of an international treaty to phase out a dozen highly toxic chemicals. But environmentalists accused officials of abandoning a

Philosophers and the ologfians may speculate about the essence of human nature, but biologists have a kick-the- tires test that should in principle, deliver an exact definition: Compare humans and

The Spanish government says its ambitious plan to divert water from the Ebro River basin in the north to the parched Mediterranean coast in the southeast is necessary not only for practical reasons

The explosive growth of greenhouse agriculture has made Almeria province one of Europe's most remarkable economic success stories. But the use of vast amounts of water for hydroponic cultivation in

The public relations battle over cloning experiments intensified in the U.S. Senate as opponents warned of embryo farms and proponents pulled out a Hollywood trump card the actor Christopher Reeve.